IAS Interview Question Part 11

Q. (1) Why there is a tiny hole in between the camera and flash on many phones?

Image of Tiny Hole in between the Camera and Flash on Many Phones

Image of tiny hole in between the camera and flash on many phones

The tiny hole is generally on the rear side of the iPhone. But for some phones it is on the front side, adjacent to the front camera.

This tiny hole is known as “Noise cancelling Microphone”.

You may be call from your iPhone when you are in a fully noisy area. But the receiving and doesn’t listen to any noise.

This is because of the special audio system present in your iPhone. This known “Noise Cancellation System”.

Q. (2) Why Sea level is written on railway station?

Image of Why Sea Level is Written on Railway Station

Image of why sea level is written on railway station

Whenever we travel by train, we see that on the board of station, the height of the station from the sea level is written on it.

Mean Sea Level (MSL) also called sea level is an average level of the surface of one or more of earth’s oceans (Sea) from which heights such as elevations may be measured. The term above sea level generally refers to above mean sea level (AMSL).

The 'Mean sea level' (MSL) is a reference level from which vertical elevation is measured.

It is fixed by observations over a long time of the surface of the open ocean, averaging out the changes due to tides, etc.

The level is then extended in an imaginary surface (an ellipsoid, or more accurately a geoid) to cover all points of the earth, including land areas far from the sea.

Heights of locations can then be given with reference to the mean sea level computed for that latitude and longitude.

This allows heights of different places to be compared in a uniform manner

Q. (3) Why Kolkata police wear white uniform?

Image of Kolkata Police Wear White Uniform

Image of why kolkata police wear white uniform?

Kolkata police wear white uniform is not just to show different but behind the some scientific reason.

It is true that Kolkata police was organized by the British Government in 1845 and they decided the white colour for their uniform.

Furthermore, white colour does not absorb the heat coming from the sunlight.

Same logic is being used behind the navy uniform.

Q. (4) What does mean of numbers on the back side of SIM card?

Image of What Does Mean of Numbers on the Back Side of SIM Card

Image of What does mean of numbers on the back side of SIM card

Your SIM serial number (SSN), sometimes called the ICC – ID (Integrated Circuit Card ID), is for international identification.

The SSN typically has 19 digits and contains specific details about your operator, your location and when it was made.

The first two digits are the telecom ID, the second two digit refer to your country code, the third two digits are the network code, the next four digits are the month and year of manufacturing, the next two digits are the switch configuration code, the next six digits are the SIM number, and the last digit is the check digit.

Q. (5) Why are there bumps on the “F” and “J” keyboard keys?

Image of Why Are Bumps on the F and J Keyboard Keys

Image of why are bumps on the F and J keyboard keys

The purpose of the bumps on the keys F and J is to guide the typist correctly while placing his fingers on the keyboard and typing without looking at the keyboard.

We have to place the left index finger of the F key and right index finger on the J key. And the rest of the finger on the adjacent keys on the home row.

Q. (6) What is the meaning of the different colour lines on the road.

While driving, we all have noticed those white and yellow lines on road. Sometimes they are solid lines and sometimes they are broken.

Solid White Line:

Image of Solid White Line on Road

Image of Solid white line on road

Solid white line indicates that you must not change lanes and should stay in the lane you are already on.

Broken white line:

Image of Broken White Line on Road

Image of broken white line on road

Broken white lines indicate that you are allowed to change lane, but with caution. So you may change lane, if it is safe to do so.

One solid yellow line:

Image of One Solid Yellow Line on Road

Image of one solid yellow line on road

Passing or overtaking other vehicles is allowed, but you cannot cross the yellow line. However, this rule may vary from state to state.

Double solid yellow lines:

Image of Double Solid Yellow Line on Road

Image of double solid yellow line on road

Passing is not allowed over double solid yellow lines.

Broken yellow line:

Image of Broken Yellow Line on Road

Image of broken yellow line on road

Passing is allowed over broken yellow line, but with caution.

Solid yellow line with broken yellow line:

Image of One Solid Yellow Line with Broken Yellow Line on Road

Image of one solid yellow line with broken yellow line on road

If you are driving on the side of the broken line, you're allowed to overtake, and if you're driving on the side of the solid line, you're not.